Home › Forum › Ask A Member › 40hp Johnson 1963 Carb Question › Re: 40hp Johnson 1963 Carb Question
OK, so you did not have the high speed fixed jet out when servicing the carb. In any event, if there is a restriction in that passage that allows only .067" through it, then a high speed jet is in place. Just because there is a jet present, does not mean it is properly seated or the correct size (not messed with or drilled out). Perhaps someone has a spare carb for that engine you could try.
And sorry, I don’t have a 40hp carb to make that depth measurement for you.
Don’t mess with that flywheel unless you confirm there is an ignition problem, no sense creating more challenges unless it is absolutely necessary!
Any chance of posting a video of the engine running/misbehaving?
I know I have asked before, but did you replace the his speed nozzle gasket: #32
http://www.marineengine.com/parts/johns … Carburetor
The engine will run very rich at high speeds if this gasket is missing at high speeds.